At least one JAR was scanned for TLDs yet contained no TLDs.

INFO:
At least one JAR was scanned for TLDs yet contained no TLDs.
Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them.
Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.

原因：

1：页面中含有<!---->注释。

2：tomcat 7对EL表达式的语法要求比较严格，包含关JAVA键字就会导致解析出错。

解决方案：

修改tomcat属性，忽略对EL表达式的关键字检查。修改tomcat 下/conf/catalina.properties文件，添加org.apache.el.parser.SKIP_IDENTIFIER_CHECK=true选项。